The company says 85 percent of the funds from key tag purchases will go toward the Dave Thomas Foundation for Adoption to support foster children waiting for their forever homes.

Dave Thomas, the founder of Wendy's and the Dave Thomas Foundation for Adoption, became an important voice in adoption awareness in 1990. That year, he led a national public service campaign and encouraged business leaders to offer adoption benefits as part of their employee benefit plans. He later testified before Congress in support of adoption tax credits and adoption legislation, and he continued to be an advocate for foster children seeking permanent homes until his death in 2002.

The key tags can be purchased until Jan. 31. Customers who present the tag between Jan. 1 and Dec. 31 will receive a free Jr. Frosty with any purchase.